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Oxygen Sensor Emulator

Discussion in 'DIY (Do-It-Yourself)' started by brucehowe, Jan 23, 2019.

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    Hey Gang,

    Need some help with my 09 128i.
    Year and a half ago installed AFE headers and cats as a lower cost alternative to OEM parts.
    Was warned that I may get codes from downstream O2 sensors.
    Was resetting and no service engine light for several months.
    Now, light comes on a few miles after reset.

    Has anyone had experience with an oxygen sensor emulator that prevents the codes?
    Another alternative would be a spacer to set the sensor further back from the stream, but I'm not sure there would be enough room.

    Any insight would be most helpful.

    Thanks so much,
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    I haven't heard of an 02 sensor emulator, but, wouldn't be surprised they exist, theoretically or even technically doesn't seem like it would be that hard to have something outputting the voltage or voltages equivalent to stoichiometric a/f ratio. What I'm wondering is why codes start triggering after so long not triggering - what could have changed...?

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